Combustor and gas turbine provided with same

A combustor comprising:

• a combustor basket in which compressed air and fuel are mixed to form a mixture with each other and the mixture is combusted;
• a transition piece in which a tip portion of the combustor basket is inserted with a gap therebetween;
• a spring clip that seals the gap between the combustor basket and the transition piece;
• a throttle section that is provided in an opening portion of the gap, the opening portion opening on a tip side of the combustor basket to the transition piece, and narrows an opening area of the opening portion, compared to a base end side of the combustor basket;
• and
• a cooling device that has a cooling fluid flow path upstream of a fixed position of the throttle section of the transition piece for cooling the throttle section,
• the cooling device comprising:
• an injection section that injects a cooling fluid toward the opening portion;
• and
• a guide section that is provided with a direction change piece and that is configured to change an injection direction of the cooling fluid toward the throttle section, the direction change piece being spaced apart from the spring clip and being spaced apart from the throttle section,
• wherein the throttle section is provided by projecting an inner surface of the transition piece toward the combustor basket.